0.405*{（x-sin（2πx）/2π）+（3x-1.25）*0.139}＝2/3*{（sin(πx）)^3/π}+0.139*446/500*{sin(πx)+sin(1.25π-2πx）}/π
    x^2-8x+15=0
    ㏑x-（x/3）=0
    ㏑x-（x/3）
    ㏑x-x/3
    x＾3-3x＾2+2
    (-0.0089x+315.58-(-0.000014x^3+0.018053x^2-7.640781x+1364.077580))(x-300) = ((-0.000014x^3+0.018053x^2-7.640781x+1364.077580)-(0.0053x+284.09))(470-x)
    y^3-3y^2+1=0
    -0.0089x + 315.58-(-0.000014x^3+ 0.018053x^2-7.640781x+1364.077580)(x-300)=((-0.000014x^3+ 0.018053x^2-7.640781x+1364.077580)-(0.0053x + 284.09))(470-x)
    200x-（-100x+1000）=300 -100x+1000-200x=300
    [-0.0037x+308.51-(-0.000003(x^3)+0.004450(x^2)-2.126399x+624.408850)](x-300)=((-0.000003(x^3)+0.004450(x^2)-2.126399x+624.408850)-(0.0034x+284.84))(550-x)
    -100x+1000=200x
    100x+1000=200x
    2388*0.0283*（50.5-x）^0.75=55.98*1.448*0.4878*（x-39）
    [-0.0037x+308.51-(-0.000003x^3+0.004450x^2-2.126399x+624.408850)](x-300)=((-0.000003x^3+0.004450x^2-2.126399x+624.408850)-(0.0034x+284.84))(550-x)
    2x=6x-2
    y=-7/48（1.75-4）（1.75-4）+3
    2/3=a（1.75-4）（1.75-4）+3
    2/3=a（4*4）+3
    cosarcsinx

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